Re: Abbreviated Tag Names

[Jonathan Borden <jborden@mediaone.net>]

You may wish to investigate creating whatever XML document you would prefer
and then compressing it with PKZIP. Compare this size with whatever other
format you are considering or already using. If your overhead after ZIP
isn't too great then you have your answer, otherwise you may have an idea
about how much to rethink the strategy. ZIP works particularly well for long
tag name compression. If you also have lots and lots of numbers then a
binary protocol might be necessary to get the smallest data size.

>
> Hi all,
>
> I'm reviving a thread that ended some weeks ago (I'm afraid I'm about 1000
> messages behind on this list).  I have been thinking about large data
> transfers myself recently.  The problem we typically face at JPL is very
> large quantities of data and of course very limited telecommunication
> capability.  Or I should say, we have excellent telecommunication
> capability, but it is still our limiting factor with the number and types
> of sensors our spacecraft carry.
>
> People in our organization are re-thinking some telecom data transmission
> formats, and XML came to mind.  Unfortunately the overhead is very large.
> It is possible in many cases that overall tag size will be greater than
> data quantity.
>
> It would be useful to mimic, in XML, the way that telecom data is
> traditionally transmitted.  Typically, in a transmission packet, there is
a
> header that describes the data that follows.  I think that an XML Schema
> could replace this header nicely.  After transmission, it should be
> straightforward to unpack the data into a complete xml document using the
> schema in the header.
>
> Is anyone working on applications of this nature?
>
> Ruth.
>
> ------------------------------------------------------------------
> Dr. Ruth Bergman ruth@jpl.nasa.gov
> NASA Jet Propulsion Laboratory 818 354-1245
> Mail Stop 301-180 Fax: 818 393-9815
> 4800 Oak Grove Dr.
> Pasadena, CA 91109-8099
>
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